SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Segments and Per Share Data (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2020 numberOfMarkets $ / shares	Jun. 30, 2019 $ / shares	Jun. 30, 2020 segment numberOfMarkets $ / shares	Jun. 30, 2019 $ / shares
Accounting Policies [Abstract]
Number of markets | numberOfMarkets	7		7
Segment Reporting Information [Line Items]
Number of reportable segments			2
Distributions declared per common share (in dollars per share) | $ / shares	$ 0.0086	$ 0.0086	$ 0.0086	$ 0.0172
Strategic Opportunistic Properties
Segment Reporting Information [Line Items]
Number of reportable segments			2